Health-Related Quality of Life in Men With Metastatic Prostate Cancer Treated With Prednisone Alone or Mitoxantrone and Prednisone

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Abstract
PURPOSE: A combination of mitoxantrone plus prednisone is preferable to prednisone alone for reduction of pain in men with metastatic, hormone-resistant, prostate cancer. The purpose of this study was to assess the effects of these treatments on health-related quality of life (HQL). PATIENTS AND METHODS: Men with metastatic prostate cancer (n = 161) were randomized to receive either daily prednisone alone or mitoxantrone (every 3 weeks) plus prednisone. Those who received prednisone alone could have mitoxantrone added after 6 weeks if there was no improvement in pain. HQL was assessed before treatment initiation and then every 3 weeks using the European Organization for Research and Treatment of Cancer Quality-of-Life Questionnaire C30 (EORTC QLQ-C30) and the Quality of Life Module–Prostate 14 (QOLM-P14), a trial-specific module developed for this study. An intent-to-treat analysis was used to determine the mean duration of HQL improvement and differences in improvement duration between groups of patients. RESULTS: At 6 weeks, both groups showed improvement in several HQL domains, and only physicalfunctioning and pain were better in the mitoxantrone-plus-prednisone group than in the prednisone-alone group. After 6 weeks, patients taking prednisone showed no improvement in HQL scores, whereas those taking mitoxantrone plus prednisone showed significant improvements in global quality of life (P = .009), four functioning domains, and nine symptoms (.001 < P < .01), and the improvement (> 10 units on a scale of 0 to100) lasted longer than in the prednisone-alone group (.004 < P < .05). The addition of mitoxantrone to prednisone after failure of prednisone alone was associated with improvements in pain, pain impact, pain relief, insomnia, and global quality of life (.001 < P < .003). CONCLUSION: Treatment with mitoxantrone plus prednisone was associated with greater and longer-lasting improvement in several HQL domains and symptoms than treatment with prednisone alone.